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Black Rot of Orchids Caused by Phytophthora cactorum and Phytophthora palmivora in Florida

    Authors and Affiliations
    • R. A. Cating
    • A. J. Palmateer , Tropical Research and Education Center, University of Florida, Homestead, FL 33031
    • C. M. Stiles , Georgia Military College, Valdosta, GA 31605
    • P. A. Rayside , Plant Pathology Department, University of Florida, Gainesville, FL 32611

      Several species of Phytophthora have been reported to cause economic damage on orchids worldwide. Of these, P. cactorum and P. palmivora have the widest host range across orchid genera, and they are the most common species affecting commercial orchid production in Florida. The objective of this guide is to provide a practical diagnostic resource for black rot on orchids in Florida.

      Accepted for publication 27 April 2010. Published 14 June 2010.